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Dhiman, Rohan; Indramohan, Mohanalaxmi; Barnes, Peter F; Nayak, Ramesh C; Paidipally, Padmaja; Rao, L. Vijaya Mohan; Vankayalapati, Ramakrishna
The Journal of immunology (1950), 11/2009, Letnik: 183, Številka: 10Journal Article
We determined whether human NK cells could contribute to immune defenses against Mycobacterium tuberculosis through production of IL-22. CD3(-)CD56(+) NK cells produced IL-22 when exposed to autologous monocytes and gamma-irradiated M. tuberculosis, and this depended on the presence of IL-15 and IL-23, but not IL-12 or IL-18. IL-15-stimulated NK cells expressed 10.6 times more DAP10 mRNA compared with control NK cells, and DAP10 siRNA inhibited IL-15-mediated IL-22 production by NK cells. Soluble factors produced by IL-15-activated NK cells inhibited growth of M. tuberculosis in macrophages, and this effect was reversed by anti-IL-22. Addition of rIL-22 to infected macrophages enhanced phagolysosomal fusion and reduced growth of M. tuberculosis. We conclude that NK cells can contribute to immune defenses against M. tuberculosis through production of IL-22, which inhibits intracellular mycobacterial growth by enhancing phagolysosomal fusion. IL-15 and DAP-10 elicit IL-22 production by NK cells in response to M. tuberculosis.
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in: SICRIS
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